Casting-machine



M. O. HELD,

CASTING MACHINE.'

APPLICATION m50 1uLY1s,191.

1,318,558. Patented 0211.111919.

2 SHEETS-SHEET l.

lai.

f" D. i l u M. 0. HELD.

CASTING MACHINE.

APPLICATION min Jun/15,1913.

Patented Oct. 14, 1919.

2 SHEETS-SHEET 2- ATTORNEY --MAX 0. HELD, F NORTH MILWAUKEE, WISCONSIN.

CASTING-MACHINE.

Specification of Letters Patent.

Patented Oct. 14, 1919.

Application filed July 16, 1918. Serial N0. 245,198.

To all whom rtmaiy concern.'

Be it known that I, MAX O. HELD, a citizen of the United States, and resident of North Milwaukee, Milwaukee county, Wis

i consin, have invented new and useful Improvements in Casting-Machines, of which the following is a description, reference being had to the -accompanying drawings, which are a partiof this specification.

This invention relates to casting machines i particularly adapted for casting small metal objects such as lead soldiers and the like, though the principles involved may apply to other molding machines.

An object of the invention is to permit of the work being quickly performed.

Another object of the invention is to perfect details of construction of a machine of this character.

With the above, and other objects in viewthe invention consists in the casting machine as herein claimed and all equivalents.

Referring to the accompanying drawings in which like characters of reference indicate the same parts in the different views:

Figure 1 is a central longitudinal sectional view of a casting machine constructed in accordance with this invention with parts in position for filling the mold;

Fig. 2 is a sectional plan view of a portion y thereof on the plane of line 2-2 of Fig. 1 on a slightly enlarged scale;

Fig. 3 is a similar view on the plane of line 3 3 of Fig. 1 but`with the parts in position for ejecting the work; Fig. 4 is a view similar to Fig. 1 showing parts in position of Fig. 3; Fig. 5 is a sectional end vew on the plane of line 5-5 of Fig. 2; and,

Fig. 6 is a sectional View on the plane of line 6-6 of Fig. 2.

In these drawings 10 indicates a base supporting a suitably lined heating chamber 11 provided with gas burners 12. A melting pot 13 is supported within theheating chamber above the burners and -in it the molding metal is melted. In the bottom of the melting pot is formed a cylindrical passageway through an opening or slot 15. A plunger 16 works within the horizontal passageway 14 to force the molten metal from said passageway and .through a vertical passageway 17 to the mold above. The movements of the plunger are produced by means of a hand wheel 18 mounted on a supporting 14 into which ythe metal Hows` bracket 19 on the base and carrying a pinion i 20'meshing with a rack 21 which has an arch-shaped connection 22 extending over the edge ofE the melting pot and down through the slot 15 and into the plunger 16.

By turning the hand wheel 18 back and forth the plunger 16 is reciprocated for feeding the moltenmetal through the pas sageways with pressure.

A nozzle 23 with a rounded end is remov` ably threaded in the Vertical passageway 17 and fits in a correspondingly shaped socket in the bottom of a box-like die casing 24 which is hinged to the end of the heating chamber 11 by pivotal conections 25 so as to bie ca able of swinging away` from the nozz e. die casing 24 to the heating chamber with the socket closely fitting on the nozzle.

The die casing 24 is open at its hinged end and closed at the other end and is preferably rectangular in cross section. Slidably fitting within the die casing area pair of die shoes 27 and 28 which rest on the floor of the die casing and are held in working engagement therewith by a pair of "guide strips 29 let into grooves in the top of the die casing. The A guide strips 29 are adjustable so as to bear evenly upon the die shoes'in their travel through the die casing by means of pairs of set screws 30, one .setscrew of each pair being threaded in the die casing and bearing on the guide strip and the other being threaded in the guide strip and engaging its head against the die casing.

The die shoes 27 and v28 are reciprocated within the die casing, the former traveling a greater distance than the latter. In their inner position die plates 31 which are secured to their meeting faces are in face to face contact with each other and the die cavities in their faces are in position to register with an opening 32 inthe door of the die casing through which the nozzle.23 discharges. f

A pair of parallel rods 33 pass through the end of the die-.casing and through the die shoes and plates, and the die shoe 2 7 is yielda'bly attached thereto, coil springs 34 surrounding the ends of the rods 33 serving to force the die shoe and its die plate against shoulders 35- on said'rods. At their ends the rods 33 are connected by a cross bar 36 which Vhas pivotally connected to :it a rod 37 slidably mounted in a sleeve 38'pivo'tally mounted at 39 on a rigid arm 40 projecting from uitable clamps 26V serve to clamp the 4 the die casing. The upper end of the rod 37 has a pivotal connection 41 with the end of a 4bent link 42, and the other end of the link is pivotally connected to an arm 43 on a shaft 44 journaled in bearings 45 on the die casing. A die operating lever 46 is fixed on the shaft 44 and when swung upwardly from the position shown in Fig. l serves to rock the rod 37 as a lever fulcrumed on the pivotal connection 39 and thus cause the lower end of said rod to force the pair of rods 33 inwardly to move the die shoe 27 from the position shown in Fig. 2 to the position shown in Fig. 4. The sliding of the rod 37 in the sleeve 38 permits of the right line movement of the rods without binding. The die shoe 28 and its die plate being loosely mounted on the rods 33 are not affected directly by the mov ments thereof but are caused to travel a short distance with the other die shoe and its die plate. A rod 47 secured to the center of the die shoe 28 passes through the end wall of the die casing and has a sleeve 48 fixed thereon and slidably passing through the cross piece 49 rigidly connected to the two rods 33. The end of the rod 4T extends beyond the end of sleeve 48 so that the end of the sleeve forms a shoulder on the rod and a pair of clamping members 50 pivotally mounted on one rod 33 and guided between a pair of collars 51 fixed on the other rod 33 are adapted to engage the rod 47 between them and compel it to move a short distance when the lever 46 is moved as described. A coil spring 52 connects the ends of the clamping members 50 to effect this engagement and a cam plate 53 secured to the side of thedie casing and projecting between the clamping members serves to spread the clamping members apart when its opposite cam shoulders are reached by them, thus disengaging the clamping members from the shoulder formed by the sleeve 48 when said sleeve engages the end of the die casing, thus uncoupling the die shoe 28 and permitting it to remain at rest while the die shoe 27 continues its outward movement. On the return movement of the die operating lever the die shoe 27 moves inwardly until the die plates 31 Contact, whereupon the die shoe 28 'moves with it to the innermost position shown in Fig. 1. In this position of the die shoes the die plates are held together with spring pressure, the springs ..34 on rods 33 bearing against die shoe 27 and spring pressed pins 54 'bearing at each corner of the die shoe 28 for this purpose. The pins 54 pass through the end wall of the die casing and are engaged by washers 55 which surround screw studs 56 threaded in the end wall of the die casing and are given a spring action by coil springs. 57 surrounding said studs and bearing on the washers.

Each die shoe is provided with a rectangular cavity into which fits a projection 58 o the back of the die plate 31, as here show consisting of a plate secured to the di plate.

The die shoes are provided with strij pers or ejectois for forcing ejector pin through openings in the die plates to di.E lodge the casting therefrom when the die are in their open position as shown in Fig 3. In the cavity of each of the die shoes i slidably mounted an ejector member prei erably consisting of a pair of plates 59 am 60 held together by screws. Ejector pins 6 project from the ejector members as b; passing through the plate 59 with head clamped between plates 59 and 60 and sai( pins pass through openings in the die plates Strike pins 62 similarly project from thl ejector members in the opposite directiox and pass through the die shoes and thosl of the die shoe 28 also pass through the en( wall of the die casing. The two strike pin: 62 of die shoe 28 are adapted to be engage(l by adjustable set screws 63 in the cross piec( 49 at the end of the opening movement oi the dies, and the single centrally positioned strike pin 62 of the other die shoe is adapted to be engaged by an adjustable set screw 64 on a bracket arm 65 removably secured tc the open end of the die casing also at the end of the opening movement of the dies. This engagement of the strike pins 62 with their respective set screws causes the eject-or members to be moved toward their die plates respectively and thus force the ejector pins 61 into the mold cavity sections to eject the casting therefrom. Coil springs 66 embedded in the ejector members and bearing on the die plates serve to return the ejector members as soon as the die shoes begin their closing movement. The iioor of the die casing and the end of the heating chamber are cut away at 67 to provide an inclined discharge chute through which the casting falls when ejected from the open dies.

In operating the machine the operator turns the hand wheel 18 with one hand to force the molten metal through the nozzle 23 and the opening 32 into the mold formed Iby the matched dies, as in Fig. 1, and he opens and closes the dies by operating the lever 46 with the other hand. The hand wheel 18 is turned with sutlicient pressure to force the metal to completely till the mold and the beginning of the outward movement of the dies closes the communication between opening 32 and the mold cavity to shear the metal which begins to harden as soon as it fills the mold, and then by the return movement of the wheel 18 the metal from the nozzle 23 and the opening 32 is drawn back by the plunger into the hot cylinder 14 to be momentarily reheated preliminary to the next operation. The continued opening movement of the die shoes carries the die shoe 28,l to the edge of the discharge chute 67 where yit stops by the opening of the clamping members 50 and the engagement of sleeve 4:8 with the end of the die casing, as described, while the die shoe 27 continues, thus separating the die plates and permit- "ting the work to fall when dislodged from the die cavity by the ejector pins as the strike pins 62 engage their set screws. In molding small objects'such as lead soldiers .and the like, the cooling of the work may be accomplished so rapidly as to'permit of the continuous movement of the operating lever 46, but with larger castings or if the metal is too hot the movement of the operating .lever may be discontinued momentarily after shearing the metal from the openingA 32 to allow the work to harden before discharging it by completing the opening of v the dies. When the work is discharged the lever 46 is immediately returned to its lower position, thus returning the die plates to their matching relation under pressure of the springs 34 and 57 which assure their tight fit under all conditions, and the operatipn is repeated. With each succeeding stroke of the plunger 16 a new supply of molten metal is admitted to the cylinder 14 from the melting pot through the uncovered portion of the slot 15. Should the opening 32 become clogged, the clamps 26 are released and the die casing is swung on its pivotal connections 25 to expose the opening 32 for cleaning. At the same time a stoppage of the nozzle 23 may be relieved by ratus shown is only illustrative, and that the invention can be carried out by other means within thelscope of my,claims.

What I claim as new and desire to secure by Letters Patentis:

1. In a casting. machine, the combination of a pump for supplying molten metal under pressure, a die casing having an opening throughwhich the metal is forced by said pump, a pair of die members movably mounted in the die casing and forming a mold cavity between them registering with said opening, and means for moving the die members across said opening to shean-the metal connection with the castin and for casting.

` separating said members to di c arge the 2. In a casting machina-a metal pump for forcibly supplymg moltenl metal, a nozzle through which the pump discharges, a hinged die casing havin a socket adapted to swing into fitting relation with the nozzle, means for clamplng the die casing in place, there being an opening through the die casing leading from the socket, and movable. die members within the die casing forming a mold cavity between them communicating with the opening of the die casing.

3. In a casting machine, a suitably heated melting pot, a cylinder therein having an opening through which metal flows from the melting pot to the interior of the cylinder, a plunger working in the cylinder, there being a passageway leading from the cylinder, a nozzle removably threaded in the passage- Way and provided with a tapering bore and a rounded projecting end, a pivotally mounted die casing having a socket fitting on the rounded end of the nozzle communicating through an opening with the interior of the die casing, and die members movable within the die casing forming a mold cavity between them registering with said opening.

4. In a casting mabhine, a suitably heated melting pot, ra cylinder formed therein having an opening admitting molten metal and having a vertical discharge passageway leading therefrom, a plunger fitting in the cylinder, a rack and pinion operating means en-d gaging the plunger through said opening, a nozzle at theeend of the passageway, and a movable die casing fitting on the nozzle and containing a mold cavity having communication with the nozzle. A

5. In a casting machine, a metal pump for supplying molten metal under pressure,1 a die casing having an opening through which the metal is forced by said pumpna pair of die members movably mounted 1n the die casing and forming a mold cavity between them registeringwith said opening, and means for moving the die members together away from said opening to shear theJ metal connection with thecasting and for moving one die member away from the other to discharge the casting. 6. In a casting machine, a die casing having an opening through which molten metal may be forced, die members slidably mounted in-'the die casing and-forming a mold cavity between them-registering with the opening, operating means for moving the rst die member away from'the opening, means for connecting the second die member with said operating means for causing it to K move with the first die member, and means for automatically disconnecting said connecting means and stopping the movementl of the second die member while the first die member moves away from it to discharge thel casting from the mold cavity.

7 In a casting machine, a die casing having an opening through which molten metal A may be forced, a pair of die members slidably mounted in the die casing and forming a mold cavity between them registering with the opening, a pair of rods secured to the first die member and passing through the end of the die casing, operating means connecting `with the pair of rods for moving the first die member, a pair of clamping members pivotally mounted on one of the rods, flanges on the other rod |between which the clamping members are guided, a spring connecting the clamping members, a rod on the second die member passing through the end of the die casing and provided with a shoulder adapted to be engaged by the clamping members, and cam means between the clamping members for forcing them apart to release the rod of the second die member.

8. In a casting machine, a die casing having an opening through which molten metal may be forced, a pair of die members slidably mounted in the casing forming a mold cavity between them registering with said opening, a pair of rods yieldingly connected with the first die member and passing through the end of the die casing, operating means connected with the rods, a rod on the second die member passing through the end of the die casing, automatically operating connecting means for connecting the rod of the second die member with the rods of the first die member, and yielding means against which the second die member bears.

9. In a casting machine, a die casing having an opening through which molten metal may be forced, a pair of die members slidably mounted in the die casing and forming a mold cavity between them registering with the opening, and a pair of adjustable guide strips in the wall of the die casing opposite the opening for holding the die members against the Wall of the' die casing containing the opening.

10. In a casting machine, a die casing having an opening through which molten metal may be forced, a pair of die members slidheisses a'bly mou'nted in the die casing and forming a mold cavity between them registering with the opening, means for'movingv the die members, and spring means pressing the die members together in their closed position.

11. In a casting machine, a die caslng having an opening through which molten metal may be forced, a pair of die members slidably mounted within the die casing and forming a mold cavity between them registering with the opening, a sleeve pivotally mounted on the die casing, a rod slidably fitting in the sleeve, a suitably operatedh crank on the die casing, a link connecting the crank with the rod, and means connecting the rod with the die members.

l2. In a casting machine, a die casing having an opening through which molten metal may be forced, a pair of die members slidably mounted in the die casing forming a mold cavity between them registering with the opening, means for moving the die members, ejector means 'within the die members having ejector pins extending into the mold cavity and strike pins in the opposite direction, and means for engaging the strike pins for projecting the ejector pins.

13. In a casting machine, a die casing having an opening through which molten metal may be forced, die members slidably mounted in the die 'casing forming a mold cavity between them registering with the opening, springpressed ejector members slidably mounted within the die members and provided with ejector pins extending into the mold cavity and strike pins projecting in the opposite direction, operating means for .moving one die member farther than `the other, a stop for engaging the strike pin of the one die member, and means actuated by the operating means for engaging the strike pin of the other die member.

In testimony whereof I aix my signature, in presence of two witnesses.

MAX 0;. HELD.

Witnesses:

R. S. C. CALDWELL, H. D. CHASE. 

